TY - JOUR
T1 - Structural and optical characteristics of pre- and post-annealed sol-gel derived CoCu-oxide coatings
AU - Miran, Hussein A.
AU - Rahman, M. Mahbubur
AU - Jiang, Zhong Tao
AU - Altarawneh, Mohmmednoor
AU - Chuah, Lee Siang
AU - Lee, Hooi Ling
AU - Mohammedpur, Ehsan
AU - Amri, Amun
AU - Mondinos, Nicholas
AU - Dlugogorski, Bogdan Z.
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017
Y1 - 2017
N2 - Sol-gel derived CuCo-oxide coatings as solar selective surfaces, synthesized onto aluminium substrates at various annealing temperatures, are analysed by correlating their structural, chemical bonding states, and surface morphological topographies. As the annealing progressed, all the coatings displayed a Cu0.56Co2.44O4(ICSD 78-2175) phase with preferential orientation along (400) reflection plane. Rietveld refinement of X-ray diffraction (XRD) data indicate that residual stress and microstrains developed around the coating surfaces are reduced resulting in mechanically stable thin films. Enhancement of the crystallite size and preferred orientation of the surface were confirmed via XRD, field emission scanning electron microscopy (FESEM), and atomic force microscopy (AFM) analysis. X-ray photoelectron spectroscopy (XPS) analysis shows tetrahedral, octahedral and mixed states of Cu and Co ions with a stable atomic ratio of Co/Cu, and an increase of O and C contents but no metal-carbon bonding on the surface of materials. Optical reflectance investigations indicated that solar selectivity of the coatings increased from 3.81 to 24 as the annealing temperature reached up to 500 °C.
AB - Sol-gel derived CuCo-oxide coatings as solar selective surfaces, synthesized onto aluminium substrates at various annealing temperatures, are analysed by correlating their structural, chemical bonding states, and surface morphological topographies. As the annealing progressed, all the coatings displayed a Cu0.56Co2.44O4(ICSD 78-2175) phase with preferential orientation along (400) reflection plane. Rietveld refinement of X-ray diffraction (XRD) data indicate that residual stress and microstrains developed around the coating surfaces are reduced resulting in mechanically stable thin films. Enhancement of the crystallite size and preferred orientation of the surface were confirmed via XRD, field emission scanning electron microscopy (FESEM), and atomic force microscopy (AFM) analysis. X-ray photoelectron spectroscopy (XPS) analysis shows tetrahedral, octahedral and mixed states of Cu and Co ions with a stable atomic ratio of Co/Cu, and an increase of O and C contents but no metal-carbon bonding on the surface of materials. Optical reflectance investigations indicated that solar selectivity of the coatings increased from 3.81 to 24 as the annealing temperature reached up to 500 °C.
KW - Annealing temperature
KW - Bader charges analysis
KW - Copper cobalt oxides
KW - Density functional theory
KW - Solar selective surface
KW - Solar selectivity
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U2 - 10.1016/j.jallcom.2017.01.079
DO - 10.1016/j.jallcom.2017.01.079
M3 - Article
AN - SCOPUS:85009853918
SN - 0925-8388
VL - 701
SP - 222
EP - 235
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -